#!/usr/bin/env node

import { writeFile } from "node:fs/promises";
import process from "node:process";
import { bindingSchema } from "../bindings/index.js";
import { compileCapabilityResourceRepository, type ResolvedCapabilityResource } from "./assembly.js";
import { createGitCapabilityResolver } from "./git-resolver.js";

const usage = `usage: quixos-resource-compile --root DIRECTORY --kind interface|package
       --repository URL --commit GIT_REV --checkout-root DIRECTORY
       [--snapshot-map PATH] [--snapshot-only true] [--graph-out PATH] [--schema-out PATH]

Resolves a standalone resource's recursive dependency-lock graph, validates
its interface.qx or package.qx manifest, and emits the checked resource as JSON.`;

const parseArgs = (args: string[]) => {
  const values = new Map<string, string>();
  for (let index = 0; index < args.length; index += 2) {
    const key = args[index];
    const value = args[index + 1];
    if (!key?.startsWith("--") || !value) throw new Error(usage);
    if (
      ![
        "--root",
        "--kind",
        "--repository",
        "--commit",
        "--checkout-root",
        "--snapshot-map",
        "--snapshot-only",
        "--graph-out",
        "--schema-out",
      ].includes(key) ||
      values.has(key)
    )
      throw new Error(usage);
    values.set(key, value);
  }
  const rootDirectory = values.get("--root");
  const kind = values.get("--kind");
  const repository = values.get("--repository");
  const commit = values.get("--commit")?.toLowerCase();
  const checkoutRoot = values.get("--checkout-root");
  if (!rootDirectory || !repository || !commit || !checkoutRoot || (kind !== "interface" && kind !== "package")) {
    throw new Error(usage);
  }
  if (!/^([0-9a-f]{40}|[0-9a-f]{64})$/.test(commit)) {
    throw new Error("--commit must be a full Git object ID");
  }
  if (values.has("--snapshot-only") && values.get("--snapshot-only") !== "true")
    throw new Error("--snapshot-only accepts true");
  return {
    rootDirectory,
    kind,
    repository,
    commit,
    checkoutRoot,
    snapshotMap: values.get("--snapshot-map"),
    snapshotOnly: values.get("--snapshot-only") === "true",
    graphOut: values.get("--graph-out"),
    schemaOut: values.get("--schema-out"),
  } as const;
};

const graphEntry = (node: ResolvedCapabilityResource) => ({
  key: node.key,
  kind: node.kind,
  source: node.source,
  directory: node.directory,
  resourceId:
    node.resource.kind === "interface" ? node.resource.revision.interfaceId : node.resource.revision.packageId,
  revisionId: node.resource.revision.revisionId,
  dependencies: [...node.dependencies.entries()].map(([binding, dependency]) => ({
    binding,
    resourceKey: dependency.key,
  })),
});

const main = async () => {
  if (process.argv.includes("--help") || process.argv.includes("-h")) {
    process.stdout.write(`${usage}\n`);
    return;
  }
  const options = parseArgs(process.argv.slice(2));
  const resolveResource = await createGitCapabilityResolver({
    checkoutRoot: options.checkoutRoot,
    snapshotMap: options.snapshotMap,
    snapshotOnly: options.snapshotOnly,
  });
  const compiled = await compileCapabilityResourceRepository({
    rootDirectory: options.rootDirectory,
    kind: options.kind,
    source: {
      resolver: "git",
      repository: options.repository,
      commit: options.commit,
    },
    resolveResource,
  });
  if (options.graphOut) {
    await writeFile(
      options.graphOut,
      `${JSON.stringify(
        {
          formatVersion: 1,
          quixos: compiled.lock.quixos,
          root: graphEntry(
            compiled.resources.find(
              (node) =>
                node.source.repository === options.repository &&
                node.source.commit === options.commit &&
                node.kind === options.kind,
            )!,
          ),
          resources: compiled.resources.map(graphEntry),
        },
        null,
        2,
      )}\n`,
    );
  }
  if (options.schemaOut) await writeFile(options.schemaOut, `${JSON.stringify(bindingSchema(compiled), null, 2)}\n`);
  process.stdout.write(`${JSON.stringify(compiled.resource, null, 2)}\n`);
};

main().catch((error: unknown) => {
  process.stderr.write(`${error instanceof Error ? (error.stack ?? error.message) : String(error)}\n`);
  process.exitCode = 1;
});